WILLIAMS 345 SportJet
Parts, maintenance and diagnostics for this tender
The Williams SportJet 345 is a jet-propelled sport tender designed for yachts from approximately 16 meters in length. With its 90 HP BRP Rotax ACE 903 engine, its sport hull and five-person capacity, it combines the functions of a yacht tender with those of a high-performance small leisure boat.
It can be used for transfers between the yacht and the shore, coastal outings, or water activities. This guide presents the main features of the Williams SportJet 345, its Rotax engine, common maintenance parts, and the main points to check in case of a problem.
Find parts for your WILLIAMS SportJet 345
- Engine parts
- Fuel system
- Ignition
- Sensors
- Electrical parts
- Cooling
- Oil and filters
- Gaskets and seals
- Turbine block parts
- Other
Technical specifications of the Williams SportJet 345
- Overall length: 3.45 m.
- Width: 1.77 m.
- Dry weight: 362 kg.
- Height: 0.93 m.
- Height in low configuration: 0.85 m.
- Engine: BRP Rotax ACE 903 – 90 HP, 3 cylinders, 4-stroke, 899 cm³.
- Propulsion: jet.
- Capacity: 5 people.
- Fuel tank: 50 liters.
- Maximum speed: up to 74 km/h.
- Recommended yacht: 16 to 21 m.
The 90 HP BRP Rotax ACE 903 also powers the TurboJet 285 and TurboJet 325 presented in our guides. Some maintenance parts may be common when the OEM references and installations match. Being part of the same engine family does not guarantee the interchangeability of all components. See our complete Rotax ACE 903 engine guide.
How often should the WILLIAMS SportJet 345 be maintained?
In the WILLIAMS documentation, the program below follows the same maintenance schedule as that of the TurboJet 285 or 325.
| Frequency | Maintenance to be carried out | By |
|---|---|---|
| After each use at sea | Flushing the exhaust system | User |
| Every 10 hours at sea | Engine anti-corrosion protection | User |
| Every month (2 weeks at sea) | Sacrificial anode check | User / Workshop |
| 50 hours or 1 year | Oil change + oil filter + general check of the engine, cooling, fuel, electrical system, steering and propulsion | Workshop |
| 100 hours or 1 year | Oil change + filter + periodic checks + lubrication | Workshop |
| 100 hours | Replacement of the power take-off (PTO) boot | Workshop |
| 200 hours or 2 years | Coolant + spark plugs + thorough cleaning/checks | Workshop |
| 200 hours | PTO sleeve + seal and propeller shaft seal/sleeve | Workshop |
In a marine environment, regularly monitor the engine oil, oil filter, spark plugs, fuel system, cooling, battery, electrical connections, anti-corrosion protection, steering, propulsion block, and anodes.
The SportJet 345 has an engine flush point. After use in salt water, flushing and corrosion protection help ensure the longevity of the engine and its components. Follow the WILLIAMS and Rotax procedure corresponding to your tender; our engine flushing guide complements these recommendations without replacing the model manual.
Common parts of the WILLIAMS SportJet 345
This selection provides an overview of the compatible parts available on www.rotaxtenderparts.com. OEM references serve as a starting point to determine the corresponding aftermarket reference. Click on a "Buy" thumbnail to add one unit of the product to the cart and access the cart. When several versions require a choice, the "Choose the version" thumbnail opens the product page. The names and references retain their links to the product pages.
The iNR connector only concerns tenders equipped with this option.
Common problems with the WILLIAMS SportJet 345
The following symptoms can have several causes. These clues guide inspections but do not constitute a diagnosis or an indication of automatic part replacement. Fuel, moving parts, and electrical system work must be carried out safely, according to the manual, and by a professional when necessary.
- The engine does not start: check battery voltage, electrical connections, battery disconnect, kill switch cable, fuses, relays, fuel supply, fuel pump, spark plugs, coils, and any fault codes. A battery capable of powering accessories may not provide sufficient voltage during starting.
- Engine misfires: ignition components, fuel supply, sensors, and electrical connections are among the clues to examine. A targeted check helps avoid replacing parts at random.
- The engine starts but lacks power: insufficient fuel supply, clogged filter, incorrect fuel pressure, faulty injector, spark plug or coil, engine sensor, cooling, electronic limitation, or propulsion block. Reading fault codes can guide the diagnosis.
- Fault code displayed: the electronic system may report an anomaly and limit engine performance. A code indicates a detected fault, not necessarily a defective part.
- The engine overheats: check water supply, cooling system, hoses, any obstructions, temperature sensors, and exhaust system. Stop the engine in case of a persistent warning and find the cause before continuing use. After use in salt water, perform the flush according to the manufacturer's recommendations.
- The SportJet 345 lacks thrust: the engine is not necessarily at fault. Have the intake screen, propulsion block, internal impeller, and forward / reverse system inspected. Ingested algae, ropes, plastic bags, or other debris can greatly reduce performance. Stop the engine and prevent any restart before inspection; do not attempt to clear the water intake while the engine is running.
Consult our Rotax fault code guide to identify recorded faults and guide inspections. (FMT)
How to identify the right part for your SportJet 345?
Send us a clear photo of the part, its OEM reference when visible, the model, year, and engine identification information. Specify the presence of options such as iNR for the components concerned. We can help you identify a suitable replacement part.
You can also use our tool: Identify my part from a photo.
SportJet 345 or TurboJet 325?
The Williams SportJet 345 and TurboJet 325 described here both use the 90 HP Rotax ACE 903, but their designs differ.
| Feature | TurboJet 325 | SportJet 345 |
|---|---|---|
| Length | 3.29 m | 3.45 m |
| Engine | Rotax ACE 903 – 90 HP | Rotax ACE 903 – 90 HP |
| Capacity | 4+1 people | 5 people |
| Tank | 40 L | 50 L |
| Top speed | 77 km/h | 74 km/h |
| Yacht type | 16–21 m | 16–21 m |
The TurboJet 325 prioritizes compact format and performance, while the SportJet 345 adopts a configuration more focused on water sports and onboard comfort. The SportJet features a rear platform facilitating access to the water and equipment designed for water sports. Consult our Williams TurboJet 325 guide.
WILLIAMS SportJet 345: Frequently Asked Questions - FAQ
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What engine is fitted to the Williams SportJet 345?
The SportJet 345 presented here is equipped with a BRP Rotax ACE 903 producing 90 HP.
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What is the engine displacement of the SportJet 345?
The Rotax ACE 903 is a three-cylinder four-stroke engine of approximately 899 cm³.
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What spark plugs does the Williams TurboJet 345 use?
The Rotax ACE 903 engine equipping the Williams 345 TurboJet uses NGK CR8EB type spark plugs. Always check the reference corresponding to your engine before replacement. Our set of 3 CR8EB compatible spark plugs is described as a high-performance generic alternative.
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What oil should be used in a Williams TurboJet 345?Use an oil compliant with the specifications recommended by BRP for the Rotax ACE 903 engine, checking the application of the BRP XPS 4T 5W-40 to your year. Follow the maintenance recommendations of your tender. For other engines, consult the Rotax 1503 and Rotax 1630 guides without automatically applying their recommendations.
- How often should a Williams TurboJet 345 be serviced?First service after break-in: confirm its due date in the documentation corresponding to your year. The following intervals: depend on the tender's hours and the date of the last service. The table kept above provides for interventions at 50, 100 and 200 hours or according to the corresponding calendar intervals.
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Does the SportJet 345 have a propeller?
It does not have a conventional external propeller. It uses hydrojet propulsion, with an internal propeller integrated into the turbine block.
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Can the SportJet 345 be used for water skiing?
Yes, it is designed to allow water activities and can receive a suitable tow system. Check the installed equipment and the manufacturer's instructions before use.
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How to flush a Williams SportJet 345?
The SportJet 345 has an engine flush point. Follow the WILLIAMS and Rotax instructions specific to your model, notably the order of operations and the water supply, to avoid improper water circulation. Consult our Rotax engine flushing guide in addition to the manual.
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Why does my SportJet 345 not start?
A weak battery, a relay, fuse, kill switch, fuel pump, ignition, engine sensor, or electrical circuit problem may be the cause. A precise diagnosis is recommended before replacing a part. (FMT)
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